Abstract:With the ammoniac leaching solution of copper oxidized ore in Yunnan as the pregnant solution, the process of the extraction-washing-stripping is investigated. The value changes of copper content in every product of two stages extraction and on stage strip are calculated by using the method of McCabe-Thiele Isotherm. With the technology of split-circuit extraction, the diluting of the returned raffinate can be avoided. Through the determination of ammonia content, it is proved that the volatile matter content of the ammonia and the water-expansion can be controlled.